The evolution of teeth began in the oceans around half a billion years ago. First, filter-feeding fish evolved jaws – not to ...

From wallaby to pangolin, let's explore the fascinating world of rarely-seen creatures, some of whom are on the ...

Discover animals with more than one heart, from the three-hearted octopus to multi-hearted worms—evolution’s answer to unique ...

The study, published in PLOS Biology, examined the skeletons of modern-day cartilaginous jawed fishes, like skates and sharks, along with jawless lampreys and hagfish. The jawed skates and sharks have ...

Meet the hagfish, a jawless marine creature notorious for producing massive amounts of slime when threatened. This deep-sea survivor has remained virtually unchanged for millions of years ...